Make sure you've installed the latest service packs (check your service packs)

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Use NTFS file system, not FAT (Advice on NTFS vs. FAT)

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Microsoft discourages installing IIS and .NET on an Active Directory Server. Because of this, we recommend installing IMail Server on a member server.

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IMail Server has not been tested with 64-bit operating systems.

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Microsoft .NET Framework 1.1 (get it here)

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If you have .NET 2.0 installed, you still need .NET 1.1 and configure it for the portion of IIS that runs IMail Server. Both versions of .NET can coexist on the same box, but .NET 1.1 must have been installed prior to .NET 2.0.

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Microsoft Windows Scripting Host 5.6

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Included with Internet Explorer 6.0 (get it here)

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Microsoft Internet Information Services (IIS) 5.0 or later

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We recommend version 6.0 (get it here)

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Microsoft Data Access Component (MDAC) 2.6 or later

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We recommend version 2.8 (get it here | how to check your version of MDAC)

Hardware Requirements

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Intel® Pentium® 4, 1 GHz or higher or an equivalent processor

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We recommend 3+ GHz o For high mail traffic, use multiple processors

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512 MB of RAM minimum

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We recommend 1+ GB of RAM

• TCP/IP enabled NIC card with a static IP address

• A broadband or dial-up connection to the Internet

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For mail-to-pager and IMonitor notifications, a modem and phone line is required Browser Requirements for Web Messaging Client